*{
	padding: 0;margin: 0;
}
li{
	list-style: none;
}
a{
	text-decoration: none;
}
.nav{
	width: 100%;
	height: 40px;
	background: #222;
	margin-top: 100px;
	overflow: hidden;

}
.nav .list{
	width: 1000px;
	height: 40px;
	margin: 0 auto;
}
.nav .list li{
	float: left;
}
.nav .list li a {
	display: block;
	color: #aaa;
	padding: 0 30px;
	transition: 0.5s;
	line-height: 40px;
}
.nav .list b,.nav .list li i{
	display: block;
	text-align: center;
}
.nav .list b {
	font-weight: 100;
}
.nav .list i{
	font-style: normal;
	background: #333;
	color: #fff;
}
.nav .list a:hover{
	margin-top: -40px;
}
